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Math Help - Inequalities

  1. #1
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    Inequalities

    Okay, så I'm having some troubles with these:

    cos(a) > 0,62 [0;360]degrees

    -0,56 < cos(a) < -0,14 [0;360]degrees

    (a stands for angle)

    It just says solve these inequations. How am I supposed to do this?
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  2. #2
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    Quote Originally Posted by No Logic Sense View Post
    Okay, (btw do you use a swedish keynoard?) I'm having some troubles with these:

    cos(a) > 0,62 [0;360]degrees

    -0,56 < cos(a) < -0,14 [0;360]degrees

    (a stands for angle)

    It just says solve these inequations. How am I supposed to do this?
    1. Draw rough sketches of the graphs (see attachments)

    2. Use your calculator to get the (more or less) exact values of a.
    Attached Thumbnails Attached Thumbnails Inequalities-cos_groesser.png   Inequalities-cos_zwischen.png  
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